binair to decimal

HI, I have a question. I use a plc S7 314 IFM, and I was asking myself how the binary-decimal system works. Cause when I use a binary code 0001 the decimal output us 256 ... does that mean after a binary there are added 8 zeros or what ?? some xplination please

It depends on which bytes you are reading from and writing to. It looks like you are writing to one byte, and reading back from a word. For instance, if you write a binary 1 to MB10, and then load MW10, you will indeed read 256. But if you load MB10, you'll get back a 1.

You should create a VAT table and look at MB10, MW10, and MD10 in the various formats (int, hex, binary), and you'll see what I mean.